CN104917543B - Near field communication system shares the implementation method and device of base band with Wi Fi - Google Patents
Near field communication system shares the implementation method and device of base band with Wi Fi Download PDFInfo
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Abstract
A kind of near field communication system of wireless communication field shares the implementation method and device of base band with Wi-Fi, by between digital modems and DAC and analog baseband module, NFC digital frequency converters are set between ADC and analog baseband module and digital modems, and NFC antenna is set between DAC and analog baseband module and ADC and analog baseband module, sample frequency is changed by digital modems, different bandwidth requirements and data rate requirement are realized in realization on 13.56MHz channels using different wireless communication standards.The present invention uses the 13.56MHz frequencies of near-field communication, the digital baseband block and analog baseband module of shared wireless communication system, realize in the association of IoT device authentication and encryption information transmitting procedure, or in the higher data transmission procedure of other security requirements, using short distance near-field communication, after the completion of safe transmission, then using the physical channel transmission of traditional wireless communication system.
Description
Technical field
It is specifically that one kind is used to support Wi-Fi/ the present invention relates to a kind of technology of wireless communication field
Bluetooth/Zigbee wireless communication protocols, the radio communication Internet of Things access system using near-field communication channel safety sexual clorminance
The implementation method and device of system.
Background technology
Internet of Things, i.e. IoT (Internet Of Things).Wi-Fi Internet of Things access ways are most widely used, and cost is most
It is low, one of best Internet of Things access way of scalability.Traditional Wi-Fi Internet of Things establishment of connections are based on 2.4GHz frequencies
The association verification process of band, safety-related information is also to complete to exchange in verification process on the frequency band.But Wi-Fi without
Line channel circumstance is more complicated, and the safety and reliability of wireless link is all relatively low.Therefore, the key during Internet of Things networking is recognized
Card information etc. is easily ravesdropping.
Near-field communication, i.e. NFC (Near Field Communication).Near-field communication is located at 13.56MHz frequencies, carries
Ripple wavelength is longer, and antenna size is larger, and operating distance is within 20 centimetres, therefore the physical channel environment of near-field communication has reliably
Property high, the good advantage of privacy.When two equipment need to carry out back-to-back Security Data Transmission, near-field communication modes more have
Advantage.If in the configuration process of Wi-Fi Internet of Things, completing reliable link with near-field communication modes and building, then without safety letter
Cease the risk of leakage.
By the retrieval discovery to prior art, Chinese patent literature CN203859888U, open (bulletin) day
2014.10.01, a kind of new gateway of Internet of Things is disclosed, the reliability and privacy of near field communications link is make use of, it is proposed that
The integrated NFC standard communication module in things-internet gateway, with NFC standard communication mode, reception is also equipped with NFC standard communication
The Internet of Things control instruction that the mobile phone of module is sent, enhances the security of mobile phone control instruction transmission.But, NFC standard core
Piece Module Price is higher, if to configure the module more feasible for the single gateway in only whole Internet of Things.But, with Wi-Fi
It is substantial amounts of Wi-Fi IoT equipment optional equipment NFC standard communication module in the Internet of Things of access, cost is then larger.
The content of the invention
The present invention is directed to deficiencies of the prior art, proposes that a kind of near field communication system shares base band with Wi-Fi
Implementation method and device, using the 13.56MHz frequency carrier channels of near-field communication, share Wi-Fi, Bluetooth,
The digital baseband block and analog baseband module of the wireless communication systems such as Zigbee.The invention can be applied to IoT device authentication pass
In connection and encryption information transmitting procedure, or the higher data transmission procedure of other security requirements.First with short distance near field
Communication channel, Wi-Fi, Bluetooth, Zigbee baseband signal are loaded on 13.56MHz frequency carrier channels, complete peace
After full transmission, then using the physical channel of traditional wireless communication system, transmit Wi-Fi, Bluetooth, Zigbee base band
Signal.The thinking of safe transmission is similar in practical application, and the voice signal that some are played using mobile phone is at closely tens of lis
The method that internet of things equipment is configured in the range of rice.
The present invention is achieved by the following technical solutions：
The present invention relates to the implementation method that a kind of near field communication system and Wi-Fi share base band, by digital modulation solution
Adjust between device and DAC and analog baseband module, NFC numerals are set between ADC and analog baseband module and digital modems
Frequency converter, and NFC antenna is set between DAC and analog baseband module and ADC and analog baseband module, pass through digital modulation solution
Device is adjusted to change sample frequency, different bandwidth requirements are realized in realization on 13.56MHz channels using different wireless communication standards
And data rate requirement.
Described digital modems is not limited to Wi-Fi digital modems, Bluetooth digital modems
And/or Zigbee digital modems.
(e.g., internet of things equipment to be configured is entered close to master with equipment when NFC antenna is located at the near-field region of main control device
When row configuration information is transmitted), the Wi-Fi digital baseband signals produced are modulated through NFC digital frequency converters by digital modems
13.56MHz carrier frequency is modulated to, then is wirelessly exported by NFC antenna through DAC and analog baseband module；When NFC antenna is received
During to near-field communication RF signals, the digital carrier modulation signal on 13.56MHz frequency bands is switched to via ADC and analog baseband module,
Digital baseband signal is converted into by NFC digital frequency converters again and demodulated by digital modems.
The present invention relates to a kind of device for realizing the above method, including：NFC frequency-variable modules and NFC antenna module, wherein：
The up-conversion part of NFC frequency-variable modules is arranged at the modulated terminal and DAC and the digital-to-analogue of analog baseband module of digital modems
Between conversion inputs, the down coversion part of NFC frequency-variable modules is arranged at demodulating end and ADC and the simulation of digital modems
Between the analog-to-digital conversion output end of baseband module, NFC antenna module is arranged at after analog baseband module.
Described device, is preferably further provided with multichannel between NFC frequency-variable modules and DAC/ADC and analog baseband module
Selector and demultplexer, the input and output for realizing MUX and demultplexer by operating mode control signals are selected
Select.
Described digital modems further preferably realizes the change of sample frequency by operating mode control signals.
Technique effect
Compared with prior art, technique effect of the invention includes：
1st, the normal work of existing Wi-Fi equipment is not influenceed,
2nd, support that the RF modules of near-field communication are very simple, only aerial coil and switch element, cost is extremely low, is a large amount of
The Wi-Fi accesses IoT device configurations module it is almost free of a burden.
3rd, by NFC near fields transmission various protocols baseband signal, data rate is far above tradition NFC, and passes through
The regulation of sampling rate, data rate flexibly configurable.
Brief description of the drawings
Fig. 1 is present system schematic diagram；
Fig. 2 is NFC digital up converter schematic diagrames；
Fig. 3 is NFC digital down converter schematic diagrames.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementations
Example.
Embodiment 1
As shown in figure 1, the present embodiment requires to set up in the Wi-Fi analog baseband modules of Wi-Fi internet of things equipment near
The RF modules of the coupled antenna coil of field communication 13.56MHz frequencies, and NFC digital up converter and NFC Digital Down Converts
Device, so as to realize that NFC and Wi-Fi RF modules share the Wi-Fi baseband modules of IoT equipment outfit.
As shown in figure 1, the further ins and outs requirement of NFC digital up converter therein and NFC digital down converters
For：Carrier frequency frequency is 13.56MHz.
The further ins and outs of coupled antenna coil are required：Coil inductance shunt capacitance, resonance center frequency point
13.56MHz。
System described by the present embodiment also supports near field transmission channel communication pattern beyond conventional channel communication pattern,
Specially：Under near field transmission channel communication pattern, because carrier frequency is relatively low, can under relatively low sample frequency,
Using direct digital synthesizers method synthesize carrier signal, carry out numerically, down coversion, as shown in Figure 2 NFC Digital Up Converts
NFC digital down converters shown in device and Fig. 3.
The function that Digital Up Convert is completed is that digital baseband signal is carried out into linear frequency spectrum convert, is exactly substantially by numeral
Two branch roads of I, Q of baseband signal, are multiplied by two quadrature branch of Q, I of unmodulated digital carrier signal respectively, then two
Branch road is added, and obtains the digital carrier modulation signal that I, Q two-way are superimposed,
Wherein：I(nTs) and Q (nTs) it is digital baseband signal, s (nTs) it is digital carrier modulation signal,For transmitting-receiving two
The carrier phase deviation at end, f0For carrier frequency, TsFor the sampling period.
Digital Down Convert is that the frequency spectrum of the digital carrier modulation signal that I, Q two-way are superimposed will be obtained after analog-to-digital conversion
Move to base band, separate after I, Q two paths of signals, filtered by low pass filter, recover digital baseband signal, give digital base
Band module demodulation, i.e.,：
Step 1) by the frequency spectrum shift of digital carrier modulation signal to base band：
Step 2) obtain after LPF：
, can be by system work when internet of things equipment and main control device need the higher data transfer of progress security requirement
Operation mode is set near field transmission channel communication pattern.Now, the equipment is placed on to the near-field region of main control device, by Wi-Fi numbers
The Wi-Fi data signals that word modulator is produced, 13.56MHz carrier frequency is modulated to through near field Digital Up Convert module, then through DAC and
Analog baseband module is launched by near-field communication RF and Anneta module.The near-field communication RF signals that receiving terminal is received are via near field RF
And Anneta module, ADC analog baseband modules switch to the digital carrier modulation signal on 13.56MHz, then by near field Digital Down Convert
Module converter is digital baseband signal, transfers to Wi-Fi digital demodulating blocks to demodulate afterwards.
Under near field transmission channel communication pattern, as a rule, according to the wireless communication protocol used, the system
The message transmission rate higher than traditional NFC standard system can be reached.Moreover, digital modems can be by changing number
The sample frequency of word modules work, makes different wireless communication standards adapt to the bandwidth requirement and data rate of 13.56MHz frequencies
It is required that.
When two equipment rooms carry out general data communication, you can conventional channel communication pattern is switched to, normal
2.4GHz physical channels carry out Wi-Fi data transfers.
Claims (2)
1. a kind of near field communication system shares the implementation method of base band with Wi-Fi, it is characterised in that by digital modulation and demodulation
NFC numerals are set to become between device and DAC and analog baseband module, between ADC and analog baseband module and digital modems
Frequency device, and NFC antenna is set between DAC and analog baseband module and ADC and analog baseband module, pass through digital modulation and demodulation
Device change sample frequency, realize on 13.56MHz channels using different wireless communication standards realize different bandwidth requirements and
Data rate requirement；When NFC antenna is located at the near-field region of main control device, the Wi- produced is modulated by digital modems
Fi data signals are modulated to 13.56MHz carrier frequency through NFC digital frequency converters, then wirelessly defeated by NFC antenna through baseband module
Go out；When NFC antenna receives near-field communication RF signals, the digital carrier modulation switched to via baseband module on 13.56MHz is believed
Number, then be converted into digital baseband signal by NFC digital frequency converters and demodulated by digital modems；
Described NFC digital frequency converters carry out upconversion process to Wi-Fi data signals, are specially：By digital baseband signal
Two branch roads of I, Q, are multiplied by two quadrature branch of Q, I of unmodulated digital carrier signal respectively, then two branch roads are added, and obtain
The digital carrier modulation signal being superimposed to I, Q two-way： Wherein：I(nTs) and Q (nTs) it is digital baseband signal, s (nTs) believe for digital carrier modulation
Number,For the carrier phase deviation of transmitting-receiving two-end, f0For carrier frequency, TsFor the sampling period；
Described NFC digital frequency converters carry out down-converted to digital carrier (boc) modulated signals, are specially：It will be obtained after analog-to-digital conversion
The frequency spectrum shift for the digital carrier modulation signal being superimposed to I, Q two-way is separated after I, Q two paths of signals to base band, is passed through
Low pass filter is filtered, and recovers digital baseband signal, gives digital baseband block demodulation, i.e.,：
Step 1) by the frequency spectrum shift of digital carrier modulation signal to base band：
Step 2) obtain after LPF：
2. a kind of device for realizing claim 1 methods described, it is characterised in that including：NFC frequency-variable modules and NFC antenna mould
Block, wherein：The up-conversion part of NFC frequency-variable modules is arranged at the modulated terminal of digital modems and the digital-to-analogue of baseband module turns
Change between input, the down coversion parts of NFC frequency-variable modules is arranged at the demodulating end and baseband module of digital modems
Between analog-to-digital conversion output end, NFC antenna module is arranged at the digital-to-analogue conversion output end and analog-to-digital conversion input of baseband module
Between；
MUX and demultplexer are provided between described NFC frequency-variable modules and baseband module, passes through mode of operation control
Signal processed realizes the input and output selection of MUX and demultplexer；
Described digital modems realizes the change of sample frequency by operating mode control signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510297069.XA CN104917543B (en) | 2015-06-03 | 2015-06-03 | Near field communication system shares the implementation method and device of base band with Wi Fi |
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| CN105610449B (en) * | 2015-12-25 | 2019-04-05 | 泰凌微电子（上海）有限公司 | Dual-mode RF transceiver architecture |
| CN117240675B (en) * | 2023-11-15 | 2024-02-23 | 北京紫光青藤微系统有限公司 | Demodulation method for NFC signal, NFC device and storage medium |
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| US20070205865A1 (en) * | 2006-03-02 | 2007-09-06 | Broadcom Corporation, A California Corporation | Wireless communication device with RFID reader |
| JP4770939B2 (en) * | 2009-02-13 | 2011-09-14 | ソニー株式会社 | COMMUNICATION DEVICE, COMMUNICATION CONTROL METHOD, AND COMMUNICATION SYSTEM |
| CN102917456B (en) * | 2011-08-02 | 2018-05-11 | 华为技术有限公司 | A kind of communication means, multimode terminal and base station and system |
| CN104362425B (en) * | 2014-11-20 | 2018-04-06 | 惠州Tcl移动通信有限公司 | A kind of mobile terminal of shared NFC antenna |
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Address after: Room 204, Building No. 2, 690 Bibo Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 201203 Patentee after: Lexin Information Technology (Shanghai) Co., Ltd. Address before: Room 204, Building No. 2, 690 Bibo Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 201203 Patentee before: Yue Xin information technology (Shanghai) Co., Ltd. |